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REVENUE RECOGNITION (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Feb. 09, 2018	Nov. 02, 2015	Apr. 01, 2013
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	$ 115,098,000	$ 104,251,000	$ 223,440,000	$ 201,816,000
Contractual Allowances [Abstract]
Difference between net revenues and corresponding cash collections, approximately of net revenues			1.00%
Difference between actual aggregate contractual reserve and estimated contractual allowance reserve percentage			1.00%
Maximum contractual allowance reserve estimate			1.00%
Medicare Reimbursement [Abstract]
Federal debt ceiling in connection with deficit reductions			10 years
Reductions in federal spending			$ 1,200,000,000,000
Medicare spending cut percentage			2.00%
Expected reduction in Medicare spending percentage					2.00%	2.00%	2.00%
Combined physical therapy/speech language pathology expenses			$ 3,700
Reduction in combined physical therapy/speech language pathology expenses			$ 3,000
Percentage of practice expense component			100.00%
Percentage reduction for service			50.00%
Percentage of payment for outpatient therapy services			85.00%
Net patient revenue from Medicare accounts			$ 51,100,000
Year 2017 [Member] | Maximum [Member]
Medicare Reimbursement [Abstract]
Annual limit on physical therapy and speech language pathology services			1,980
Annual limit occupational therapy services			$ 1,980
Year 2018 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in medicare payment rates			0.50%
Year 2019 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in medicare payment rates			0.25%
From 2020 through 2025 [Member]
Medicare Reimbursement [Abstract]
Percentage of increase in medicare payment rates			0.00%
Net Patient Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	105,989,000	97,657,000	$ 206,541,000	191,311,000
Management Contract Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	2,160,000	1,617,000	4,397,000	3,474,000
Industrial Injury Prevention Services Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	6,274,000	4,382,000	11,126,000	5,888,000
Other Revenues [Member]
Revenue from Contract with Customer, Excluding Assessed Tax [Abstract]
Revenue related to the various categories	$ 675,000	$ 595,000	$ 1,376,000	$ 1,143,000

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 606
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